Answer and Explanation:
The computation is shown below;
a. On book value basis
Particulars Book value Weight
Debt $70 0.2373
 (7 × $10)
common stock $225 0.7627
 ($120 + $105)
Total $295
b. On market value basis
Particulars Market value Weight
Debt $553 0.7158
 (7 × $79)
common stock $219.60 0.2842
 (120 × 0.92 + 105 × 1.04)
Total $772.60
c. The market value weight is more relevant